Impulse generator



' Aprii z3, 1935.

R. c. coUPLAND IMPULSE GENERATOR Filed Oct. 2, -1934 5 Sheets-Sheet l4 At t :l ney April 23, 1935.

R. C. COUPLAND IMPULSE GENERATOR Filed 001'.. 2, 1954 3 Sheets-Sheet- 5 Richard C Eclupland M7. WM

Patented pr.23, 'i933 Y umm STATE-s i rnr GliNEEM(inV Richard Coupland,

United States*Army,V 1 V i A c Norfolk,V Va. Y j lAppli"enzima october 2. 1934. `sigigialrm. 746,534 a a a 6 claims. (c1. set-27)" Y (.Granted"underlthe.actoffMarchhSpi883; as v j amended April 30,719.28; 370 0. G. 757) `The invention: described herein may be manuV Yfactured and used by or Vforthe Governmentfor governmental purposes, Wthout'the payment to me of any royalty thereon. i'

` This invention relatesv to an' impulse generator employed in a synchronized control system; such as is used to'control the firing of machineV guns beteen the bladesof a rotating propeller of aircra Y 'I'he purpose of this invention is "to provide an impulse generator inwhicha powerdrivenactu-y ator is selectively positioned-by either'mechanical or electrical mechanism tosupplement said mechanisms in moving a sear into orout of engagement with an impulse transmitting member.

With the foregoing and other objects in view,V

the invention resides inthe novel arrangement and combination of parts and in the details of construction `hereinafter described and claimed, it being understood thatv changes in the precise embodiment of the invention herein disclosed mayV be made vwithinthe scope of what is claimed without departing from the spirit of ,the invention. lA practical `embodiment ofthe invention* is illustrated in the accompanying drawings, where'- Y 1n: v fvFig. lffi's a View in side elevationfof a gun con- Y '1 trol assembly.

Fig. 2 is a longitudinal sectional view'of the impulse generator showing the searv'inengagement with' the cam follower.

Fig. 3 is a similar -view with the sear from the follower. f I Y I Figs.f4, 5 and-6 are sectional views on the corresponding linesof Figs.'2 and 3.` Fig.7 is a sectional view ofthecamlring. Fig. '7A is a bottomrplan view"v of thefsame.

Fig. 8 is a plan View of the plunger. Fig. 9 is a plan view of the scarl" Fig. 9A is a side elevation of the sear. y Fig. 10 is a longitudinal sectional fview of disengaged `a modification showingthe scar in engagement with the cam follower. I '.Fig. 11 is asimilarview showing the sear'disengaged fromthe follower.V` A I 1 Fig. l2V is a sectional view Von'the line I2-I2 of Fig. 10. c I s 1 l Fig. 13 is a sectional View on the line I3"- I3 of rig.11. e I. fr Fig. 14'is a sectional-view on theline IAL-#I4 of Figlo. Y f1 -j Referring to Figjl,A the gun control-assembly consists of an impulse generator A Aconnected 4`to a `trigger motor B by means of `animpulse cable and cable housing C. f jj The impulselgeneratorunit is' arrangedtocon-Q stitute a compact integralzpart of the air plane engine synchronized thereto during or after as-v sembly and it consists of a housing 5 in which is mounted a driven shaftv 6 having a gear 1 by which it receives itsv energy from a4 driving shaft 8 of the engine. The shaft 6 iS `Supported;by,antifrictionf bearings Q-S and carries'a cam 'I'Il positioned in'the lower portion Afof the housing 75. The shaft 5 rotatescat aspeedto give a cam impulseforeach blade of the propellerf of the air` planeengine; .When the shaft 6`Ais driven at the same speed as the propeller'thecam will have the Asame number of lobes.` as there. are Vblades on the propeller while the number of' lobes'will'f be doubled if the'shaft is driven at half of the prc`V peller speed; i.

A cam follower I I arrangedparallel to the driv en or cam shaft 6 is slidably'mounted in the housing 5 and has a foot I2 carrying a roller I3 adapted to engage the cam surface of the cam I0. Threadedin ,the other end ofthe follower is a plug I Il in `which is secured the impulse cable- I 5 leading-to* the trigger motor B. The cable ris sheathed in a tube i6 which islsecured in a socket Il removably held in placeby a nut I8 threaded to the housing 5.

An electrical control unit within thehousing 5 comprises"arifarmatureV I9 and commutator 20 carried'byY the driven shaftV B and a` magnetic eld ZI ycarried by a casing 22mounted on antifriction bearings V237-23 and carrying one of the bearings 9 of the-shaft 6.*The field 2l isrcfV the permanent magnetictype or as shown of the self-excited type underexcitation at all timesso that the time lag required to buildup a current flow will be aV minimum.

' 5 The"casing"22 carries brushes 24-24 wiping Willbe further referred to later on.` The rorational displacement of thecasmg is limited by cooperatingbstopsSIl-'l respectively Yon the casing2an`d the housing 5. 'I e 'Ihe upper end of the casing22 carries an axial.- ly` disposed shafty 32 on` which islxed a pinion 33. A slide 34 mounted in the upper part ofthe housing E includes avrack 35 meshing with `the pinion.v A` cable 36 attached tothe slide is ac-V tuated by a hand lever 31 placed on the control stick 28 of the airplane. c'lrhis arrangement provides,a mechanical operating .mechanism for retracting 'theslide S4 and causing the casing 22 to the rotated'. The spring 29 which rotates the slide 34 and casing 22 to normal position i's conlined between,.theslidev and a socket member 3B which isthreadedly secured tothe housing 5.

The cam follower II is provided with a lug .39 whereby itis held ininoperative position by a 

